“Just in case you missed it: We published the final article in our colour management trilogy. It covers the settings needed for Sketch, Photoshop, Illustrator, Affinity Designer and more. Lots of work and research went into this.”
(via: https://twitter.com/bjango/status/974467800944095232)

"This page is about the size and precision optimizations of sRGBz.icc a 487/491byte CC0 licensed, ICC v2 sRGB equivalent profile, with about useful for ensuring consistent handling of for instance jpgs."

"Evidently, [0.3928] came from the fact that the slope of 1/12.92 is actually a rounded version of a more theoretically correct slope of about 1/12.92321. A cutoff of 0.03928 is what you would arrive at if you used that slope.

"However, the sRGB standard defines 12.92 as the exact value to use. So I don’t think it would be correct to use 12.92321 in sRGB formulas.

"In any case, there’s certainly no reason to use 0.03928 together with 12.92. That would be half-baked, and it leads to a discontinuity that is possibly big enough to be significant."